Improvement in gauges for saw-filers



@aient @ibitza JAMES E. EMERSON, OF` TRENTON, NEWJERSEY.

Letters Patent No. 111,829, dated Februaryll, 1871.

IMPROVEMENT IN VGAUGES FOR SAV l-FILERS.

The Schedule referred to in these Letters Patent and' making pau-t ofthe same.

I, JAMES E. EMERSON, of rlrenton, in the county of Mercer in the Stateof New Jersey, have made certain Improvements in Gauges for Dressing the4Sides of Saw-Teeth, of which the following is a speciication.

rlhe teeth of saws, when swaged, in order to keep the extreme cuttingedge enough wider than the Abody ofthe tooth or plate to cut its kerfwide enough the cutting-edge of the teeth has to be employed,

and this invention relates to such gauge; and

1t consists in the use of a sheet-metal gauge, constructed to be clampedupon a common dat tile, or aile that is bent, and gauge the distance atwhich the cutting-edge shall project from the sides of the sawtooth orblade.

Figure 1 is a view of a section of a saw-tooth, with the ile and gaugein position;

Figure 2 is a transverse view of the same;

Figure 3 is a longitudinal side view of the gauge ;4

Figure 4 is a transverse view of fig. 3 and Figure 5 isa modification of1.

A represents' the tooth, or a portion of a saw-plate with a tooth thatis swaged 'at its' cutting-'edge a to be wider than the body of thetooth or plate of the saw.

B is a common file or a sharp grit-stone, and is theinstrumen't by whichthe sides ofthe teeth are out to a width, as seen in iig, 1, or it maybe bent in the shape seen in g. 5.

By bending the tile and applying 'it to the tooth;

as thus shown, the cutting-face of the tile will always leave theextreme point or cutting-edge ot' the tooth the broadest, apd will besure to have each opposite r extreme point 'of the cutting-ege projectan equal distance from the body of the tooth or plate ot the saw, as thegauge will stop the tile from cutting when it rubs against the side ot'the tooth or plate of the saw; each tooth will then have the same widthot' cutting-edge projecting equally alike on both sides of the tooth andplate, and the teeth will all revolve in the saine width of korf withoutfriction, or one tooth cutting outside of the path ofY the other.

, C is the gauge that stops the tile from cutting the sides of thecutting-edges of the teeth when it strikes or rubs against the sides otlthe body of the tooth or saw-plate.

Gauge C is formed from sheet metal by merely bending it in the -formshown in iig. 3, which will clamp itself around the body of a common datfile, either' straight or bent, and thus hold it in position on thetile, as seen in 1ig.2, or it may be made of wood, and held in position,or even strong paper will answer a good purpose, as no wear but on thesmooth side of a saw-plate is put upon it,.but I prefer the Vsheet-metalgauge, as shown in figs. 3 and 4. .'[n fig. 3, the long arm c of thebent metal is straight, and bent at c to a right anglewith the side c,and continues a greater distancethan the thickness of the ile; then itis bent to an acuteangle,

and so that at the point c." of the side c' it will he much nearer tothe side cv than whereit forms a right angle, and have less width thanthe thickness of the ile it holds. At point cf it suddenly turnsoutwardly, in order easily to receive the tile.

This shape of gauge-plate gives a spring to the l bent piece, and itwill firmly adhere to the tile when the file is placed within it, asseen in lig. 2.

W'henever the thickness ofthe sheet metal that forms the gauge C is notso thick as is desired to have the edge project from the body of thetooth or blade of the saw, a packing of paper or other thin materialthat is uniform in thickness can be inserted between the file and thesheet-metal gauge, as seen at B-in g. 2.

When insertible teeth of saws are cut from a blank having aange orprojection at Aits outer edge, the gauge may-lg eaiL against'theprojecting flange, Vand in such case a single thickness oi' the metal inthe gauge will be suilcient. But when the teeth are cut from a smoothplate of equal thickness it may require the cutting-tile to be stoppedat a greater distance from the plate of the saw, thereby giving agreater projection of width from the body of the saw than is necessarywhen the. .flanged tooth is used to project from the flange.

.lhis gauge, for truly dressing the sides of the cutting-edges ofsaw-teeth, is simple, within the reach of every one having a common flatfile and a piece of sheet metal of proper thickness, is desirable, anddoes not prevent the tile, if a straight one, from -be'- ing used forother purposes at any time when wanted, for the sheet-metal gauge canbequickly removed from the tile, and as quickly replaced again-whenwanted, and the simplicity and adaptability of the device make itvaluable.

I do not wish to confine myself to the use of a file for dressing thesides of thel cutting edges ol' saw-teeth, as other substances, such vassharp gritstones, and composition of dilerent kinds and under differentnames, that-will answerthe same puri lzilent device, when constructed,`applied, :md used in thellnzmner mid for thepurpose shown andclescribed.

J. E. EMERSON.'

VVituesses:

ANDREW HUMBERT, S. H. RANKIN.

